In Bt cotton, the Bt toxin present in plant tissue as pro-toxin is converted into active toxin due to:
Which of the following Bt crops is being grown in India by the farmers?
1. | Cotton | 2. | Brinjal |
3. | Soybean | 4. | Maize |
1. | Synthesis of cDNA from RNA using reverse transcriptase |
2. | Silencing of specific mRNA due to complementary RNA |
3. | Interference of RNA in the synthesis of DNA |
4. | Synthesis of mRNA from DNA |
Bacillus thuringiensis forms protein crystals which contain insecticidal protein. This protein:
1. | does not kill the carrier bacterium which is itself resistant to this toxin |
2. | binds with epithelial cells of the midgut of the insect pest ultimately killing it |
3. | is coded by several genes including the gene cry. |
4. | is activated by acid pH of the foregut of the insect pest. |
Some of the characteristics of Bt cotton are:
1. | long fibre and resistance to aphids |
2. | medium yield, log fibre, and resistance to beetle pests |
3. | high yield and production of toxic protein crystals which kill dipteran pests |
4. | high yield and resistance to bollworms |
The bacterium Bacillus thuringiensis is widely used in contemporary biology as a/an:
1. indicator of water pollution
2. insecticide
3. agent for production of dairy products
4. source of industrial enzyme
What is true about Bt toxin?
1. | the inactive protoxin gets converted into active form in the insect gut |
2. | Bt protein exists as active toxin in the Bacillus |
3. | The activated toxin enters the ovaries of the pest to sterilize it and thus prevent its multiplication |
4. | the concerned Bacillus has antitoxins |
1. | mosquitoes | 2. | flies |
3. | nematodes | 4. | bollworms |